Different sets of Microsoft SQL permissions are required in the following cases:

Installation (remote or local): the current account needs the CREATE ANY DATABASE permission on the SQL server level. After the database is created, this account automatically gets a db_owner role and can perform all operations with the database.

Operation: the account used to run VAO services, Veeam Backup & Replication services and Veeam ONE services requires the db_owner role, as well as permissions to execute stored procedures for the configuration databases on the Microsoft SQL Server.